Improvement in mallets for driving tubes



C. STEWART.

I Mallets for Drivi'ng Tubes, &c.

NO. 145,537, I Patented Dec.I6,-1873.

UNITED STATES PATENT OFFICE.

CHARLES STEWART, OF IVOROESTER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF HISRIGHT TO WILLIAM ALLEN, OF SAME PLACE.

IMPROVEMENT IN MALLETS FOR DRIVING TUBES, &c.

Specification forming part of Letters Patent No. 145,537, dated December16, 1873; application filcd October 1, 1873.

To all whom it may concern: 1

Be it known that I, CHARLES STEWART, of the city and county of orcesterand State of Massachusetts, have invented certain new and usefulImprovements in Mallets; and I do hereby declare that the following isfull, clear, and exact description of the same, reference being had tothe accompanying drawings which form a part of this specification, andin which Figure 1 represents a perspective view of my improved mallet.Fig. 2 represents a central section of the same with one of the headsremoved; and Fig. 3 represents an end view, one-half being shown withthe head in and the other half shown with the head removed.

In the drawings, A indicates the body. of the mallet, which I make ofiron, with an under-cut or dovetailed recess, 0, in each of its ends,said recesses being formed by the inwardly-inclined flanges a a, asshown. B B indicate the heads or working faces which are supportedwithin the recesses O O and project outward at their sides sufficientlyfar to cover the edges of the flanges at. These heads B I make ofbabbit-t-metal, and they are fixed in the recesses by being casttherein, a suitable die or mold. being placed over the end of the bodyA, as indicated by dotted lines, Fig. 2, to retain the babbitt-metal,which is melted and poured into the recess through an opening formed inthe side of the mold. The under-cut or dovetail of the recess holds thehead B securely in position when the metal becomes cold and the die isremoved. The action upon the heads, when the mallets are used, tends tocompress thebabbitt-metal more firmly into the recesses, while theflanges a support the heads from expanding, and prevent the babbittmetal D indicates the hole in which the handle is to be insertechsaidhandle being formed of wood or other material in the ordinary manner.

This improved mallet is especially adapted to driving boiler-tubes inthe manufacture of tubular steam-boilers, as it is essential that theends of the tubes should be preserved in good condition, and theoperation of driving is often quite severe. With iron mallets the endsof the tubes are liable to be injured, and wood mallets are quickly cutup and destroyed by the thin edges of the tubes, while with my improvedmallets the operation can be successfully and rapidly performed, as thebabbitt metal prevents injury to the tubes, while the iron body givesstrength and momentum to the blow, and the flanges a support the babbittheads, and prevent them from being battered down or breaking apart, aswould be the case with mallets wholly of such metal.

Having described my invention, what I claim, and desire to secure byLetters Patent as an improved article of manufacture, is

A mallet, constructed as herein shown and described.

CHARLES STEWART. YVitnesses:

CHAs. H. BURLEIGH, GEO. J. W. OoNY,

